The seed may be the truth, but the casing is usually... not.
By soul-casing, I'm referring to the -- for want of a better word -- substance that holds the contents of a soul together and makes it one soul rather than a collection of soul shards.
When I say only three spells cause damage, I mean that only three spells cause lasting, tangible, measurable damage.
*smiles* But, just because something can't be measured, doesn't mean it doesn't exist [much to his disgust]. *reaches for the first volume Snape suggested, and opens it at random* I'll look over what you've suggested, thanks.
*skimming over the book, but his tone is direct* Who's the patient?